The Navitabs Cloud app allows users to structure their content and quickly navigate between pages. It does this by creating tabs (horizontal or vertical) that look just like the tabs in Confluence menus.
This is what you can do with Navitabs:
Display other Confluence pages' content as tabs (previously Childtabs & Labeltabs): use the Tab Wizard
Display external content as tabs: use the option Tab Wizard | Embed-or-HTML-Code (works for embed & HTML code and for iFrames)
Navitabs Cloud Macros
This is the list of macros available on Navitabs Cloud, presented as horizontal tabs.